The process is I open AE, File>Open, the file starts to load for maybe 10 seconds, and then poof, AE disappears and is closed. The Mac interface displays "Adobe After Effects CC 2015.0 (13.6) quit unexpectedly. Would you like to send an error report?" This happens the same for both Open and Import.

My suspicion about the plugins appears to be well founded. One I noticed that was missing is Unmult and it appears Red Giant has a new version for CC 2015 that is built into the Universe suite. I downloaded the suite from their site and the free version includes Unmult. After installing I restarted AE and tried to open the project again and it opened with no problem.

So if anyone else runs into this problem you can resolve it by installing the new Red Giant Universe suite.